New York City investigators believe a co-worker of the Las Vegas man who killed four, including a police officer, provided a component of the deadly weapon, the 8 News Now Investigators have learned.

The man who stormed a Midtown Manhattan skyscraper paid his boss $1,400 (£1,100) for the semi-automatic rifle, police say.

NEW YORK — A man who killed four people at a Manhattan office building bought the rifle he used in the attack and the car he drove across country from his supervisor at a Las Vegas casino, authorities said Wednesday.

NYC gunman Shane Tamura is seen on video talking about his high school football career in California after a game in September 2015.